Considering that my maternal grandparents were more or less illiterate farmers, without radio, my maternal grandmother was a single mother (marrid but separated from grandpa who I never knew and who was at an unknown location (to his wife and children) at that time I doubt they even knew about it. The NRA knew, and compromised with the Roosevelt administration.
In any event, I have not continued the pattern of actions that my grandparents and parents followed in their lives (for example I'm the first in either line to graduate from college let alone hold a post bachelors degree (and of my four grandparents, only one graduated high school AFAIK). The NRA has, with a few exceptions, continued the pattern first established WRT the NFA. The pattern has undoubtably been well intentioned, but it's helped get us where we are today with respect to lack of adherance to the second amendment.
Now that would be no concern of mine, except as their slogan once went, I am the NRA, and I reserve the right to criticize my employees. And yes, I vote in their elections, for all the good that does.